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B. V. NORDBERG.

COMPRESSION CONTROLLING MECHANISM FOR ENGINES.

APPLICATION mes JAN. 28. m4.

1,157,030. Patented Oct. 19, 1915.

o o g V a D s inventor,

Witnesses a W- 1 M W I PM 0 I JMWIWIMIZMMM flttorne ya.

the latch is held out of operative position and the valve remains closed.

18 with an eccentric (not I shown) on the crank shaft or other s'yhchionolisly rotating" part of the engine, from which it receives its roeliing inevmen middle a rm f-t-he lever is connected b1 0d 19 with n;

weighted lever 20, which is loosely fulcrumed n the tud-l2; :.:Tl?he .we gh on he lever; 20'

operates when free toaet, throughthe lever. s I te sh tteth itripssams:l? efp sit fi et r lea eo ut .i fli; th an re t e'lnve'r 20 W we gh '.-be ng l m y we adains able st pfiltwh c =i et mrele se- P nd? Permit ,1 he wives to, r 1 a k .o th t r le t exh ust; trokes; efwthe ipistw e se es-rem in g: losedde ine theientire wmz dngstm s oi. the pi s.- en when t e 2 engine perates: a! mo r.

ent itugal sevemens twhich is-mnneeted with and (animated by the engine; in. the; wi h; fiii-v lly' su ta le; manner, li e n w of the saw 25 nd the adjustmen tits wnnwtiens with thegovernorterespch;

-' thfl'z'wh fith t Bngm attains a certainve, e ityt he rin a si;l3; illi e s it oz position to release andtpermit;the-waives-Ac o! at ai ifi enw from-t ends f th etampeen m at strokes otthe' i tmai Pref-1 1;; mmy-lat such no ntsitha- -the wonkinsfiuid.

wefine timhe y nde i l b w eprw ed:

q; its, m tietipressumse that whfif ia hQ- eg m ems etihtgh 0r:- nqnmn i pe Willi: p edate l m iadmton c d! lit -e simi an tehe: exha st Wai {th p n d; am n Ope -1 to 'the point ,atwhich the tlfippam 13 Kinder control of the governor, releases ands permits theexhaust valve to close. 7 From;

eP H d the w r i flui is o n edv sv-tee s e t d by h r ed ne t itsfinitial pressiire at the end of the. return onexhaustustroke of the, piston, when the admissiomor inlet valve is again opened. Undfil; these. conditions, not .only is the. ,momentnni of .the rapidly reciprocating parts -of the engine checked, and damage to the engine prevented, but also economy of powerds effected by the compression of the workingtluid to its initial pressure in the clearance'space represented by the line fg., in and 3, at the end of the return or exhaiist stroke ofthe piston, since the power .yid-i edmit e 5 th ey-li def: fmmfe ebw l exnmd s f m No -t5'-x he mevsmset lei-t ni r ersed d;

represented by the area aefg would thers? be me e i sense-try to fi s "-t h--.c ei a e set E ing'fliii'dat initial ressure at'tliebgifining of each working stroke of the piston when this eihaZ-hsteiiat the end of the rern st iqke The metres-std mechanism shown by full lines in Fig. 1 the con:

dition it ass'ilmes when the engine 'athi-glr counterpoise 30 of the governor is lifted, and the indicator card or diagram shown: byaFigiz-2; illustrates:th distribution of the .wm'kingi flwidain he :fi'ylinder-.aimder theseconditionsm- Whenft-he-engine'runs'atlow and the counter-poise; of; the governor." descends-,- the compression; controlling mechanism snmes; the condition 5 indicated} 5 by dotted lines Fig. -15; -=pa4rt of; the: gamj 25 being; FIILOEYBd= a ay :fi'QHi the E roll r- 2 nd permitting the levenfit tosibe atamedaby its weight; jargainst t e stop 1 .Unde these conditions ,the latches; 111 awlllj'be held =ig,1-,en-. 2 gagement th t e a m the-exha st val es It will; :he eld pen to .01: nearly-1 to the endslo-f the return or; exhaust-strokes got the piston.

The distributionof; the the-cylinder and the: operation tithe; e11? ginerunn g --a speeds as 1 ill strated 2h i d tor;t dierifitagrem lmw shr ig ace rdi gito whie the working-fluid! its-ad itted to the cylinderirom e to nth' admission or: inlet valve elosing at thew-point f and expansion; fgwp ece ,fnem b -.tO;-'th.e.

Wo king stmk lqtl the pis on? e-exhaust-valve onea uet-at aint at 6 161.0

mt is held a n n t .021 near n to -the and of hmnetu n stmkeet thenistqn, -s lsz ing t dith-littl .01;- nq s mpress om t. Unde 10&

ndi ionsthe eng ne n n be-r-un grx lenln i.

stopped a d wh n the-1 1mm 11s i rpp' l pl fi ds maninulatecl or ma e -t ete 'mith ease slidnre isi n, b -the P wers-:1 reptesent d-ihy mearea-swwi fmywnfi h Wo ki giflui in! t e clearanc hane-is l st-1 since this space, which is exhausted at-thez end pi each return stroke e f; v il ist'on,

sthe fi edw h uid. to nit al p ess r t he begi ning f: e ery orking s r ke at h upi ll i i l A e el; 2- eonnect d bm-e b -3 hn l wise, with the weightedleveriw, is prowided for shifting the compression controlling mechanism independently of thegovernon comprising caravans hailasfgutvalite, waive ioperaatingaemechanism coiip rising-wlnsingamh nspgopenigng means an i s n nae s, g overnor connedtia' i il lth hb' r itasiil isesis and adapted when the engine attains a ceriarimisiied to release and permitatheaialviaitoic' se before the piston reachesihernd bfitsfxhaust strokeand when the engine runs below that weeth to hoizbthe vslve upem approximately t0 the end of the exhaust piston.

2. In an engine the combination of an exhaust valve, valve operating mechanism comprising means tending to close the valve, opening means and releasing means, and agovernor connected with the releasing means and adapted when the engine attains a certain speed to release and permit the valve to close at such a point in the exhaust stroke of the piston that the working fluid confined in the cylinder will be compressed to its initial pressure at the end of such.

stroke and when the engine runs below that speed, to hold the valve open approximately to the end of the exhaust stroke of the piston.

3. In an engine the combination of a cylinder provided adjacent to its ends with exhaust valves, valve operating mechanism comprising means tending to close the valves, opening means and releasing means, a weighted lever connected with said releasing means and tending when free to delay the closing of said valves, and a governor connected with said lever and adapted when the engine attains a certain speed to shift said releasing means into position to permit the valves to close before the piston reaches the end of its exhaust strokes and when the engine runs below that speed, to shift said releasing means into position to hold the valves open approximately to the end of the exhaust strokes of the piston.

4. In an engine the combination of a cylinder provided adjacent to its ends with exhaust valves, valve operating mechanism means tending to close the valves, opening means and releasing means, a weighted lever connected with said releasing means and tending when free to delay the closing of the valves, a stop for limiting the movement of said lever in the direction of delayed release and arranged to release and permit the valves to close near the end of the exhaust strokes of the piston, and a governor connected with said lever and adapted when the engine attains a certain speed to shift said releasing means into position to release and permit the valves to close at such points in the exhaust strokes of the piston that the working fluid will be compressed approximately to its initial pressure at the ends of such strokes.

5. In an engine the combination of a cylinder having exhaust valves at the ends,

talveiapeeatingi mechanism compi'isinlgaohisa opening. means; i'andv-releasing means,i-la 1' weighted i lever; connected with and tendingwtok ShiflliS&ld 1;B18aSliIg!iIfi8RH into piositim to freieases are; penniilnthew gflvesito close; at the end on the eirhaust stzioke 49f the the opposite direction and a governor con- 'and eelapted wheifi tlve eehg'ifit attains a certain speed to shift said cam, lever and releasing means into position to release and permit the valves to close before the piston reaches the ends of its exhaust strokes.

6. In an engine the combination of a cylinder having exhaust valves at the ends, valve operating mechanism comprising closing means, opening means and releasing means adapted to release and permit the valves to close at diiferent points in the stroke of the piston, a weighted lever connected with and tending to shift said releasing means into position for later release, a stop for limiting the movement of said lever in that direction, a rocker arm connected with said lever for shifting it in the opposite direction, a cam arranged to cooperate with said arm and a governor connected with said cam and adapted when the engine attains a certain speed to turn said arm and weighted lever into position for earlier release of said valves on the exhaust strokes of the piston.

7. In an engine the combination of a cylinder having exhaust valves at the ends, valve operating mechanism comprising means constantly tending to close the valves, closing means and releasing means, a governor connected with said releasing means and adapted when the engine attains a certain speed to release and permit the valves to close before the piston reaches the ends of its exhaust strokes and when the engine runs below that speed to hold the valves closed approximately to the ends of the exhaust strokes of the piston, and means for manually shifting said releasing means independently of the governor.

In an engine the combination of a cylinder having exhaust valves, rocker arms connected with the valves, means connected with said arms and tending to close the valves, rocking levers having fulcrums concentric with the pivots of said arms, latches pivoted to said levers and adapted by engagement with said arms to open the valves, trip cams pivoted to said levers and engaging said latches, a rocking carrier arm, a T- lever mounted on said carrier arm and connected with said cams, a cam adjusting lever fulcrumed concentrically with the pivot of said carrier arm and connected with the middle arm of said T-lever, a governor actuated by the engine, a cam connected with the governor and adapted to shift the cam 

